active region

Credit: A. Title (Stanford Lockheed Institute), TRACE, NASA

A localized volume of the Sun's outer atmosphere where powerful magnetic fields, emerging from subsurface layers, give rise to various short-lived features. These features may include:

sunspots and faculae in the photosphere
plages, fibrils, and filaments in the chromosphere
coronal condensations in the corona.

Solar flares are also associated with active regions.

Related category

• SOLAR TOPICS

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